EP0427075B1 - Procedure and apparatus for producing elevator load data - Google Patents

Procedure and apparatus for producing elevator load data Download PDF

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Publication number
EP0427075B1
EP0427075B1 EP90120654A EP90120654A EP0427075B1 EP 0427075 B1 EP0427075 B1 EP 0427075B1 EP 90120654 A EP90120654 A EP 90120654A EP 90120654 A EP90120654 A EP 90120654A EP 0427075 B1 EP0427075 B1 EP 0427075B1
Authority
EP
European Patent Office
Prior art keywords
elevator
elevator car
unit
detectors
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90120654A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0427075A2 (en
EP0427075A3 (en
Inventor
Pekka Torenius
Heikki Mällinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kone Elevator GmbH
Original Assignee
Kone Elevator GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kone Elevator GmbH filed Critical Kone Elevator GmbH
Publication of EP0427075A2 publication Critical patent/EP0427075A2/en
Publication of EP0427075A3 publication Critical patent/EP0427075A3/en
Application granted granted Critical
Publication of EP0427075B1 publication Critical patent/EP0427075B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3476—Load weighing or car passenger counting devices
    • B66B1/3484—Load weighing or car passenger counting devices using load cells

Definitions

  • the present invention relates to a procedure and an apparatus for producing load data in an elevator, said procedure employing one or more tension sensing detectors placed in an elevator car unit or in a member carrying the weight of an elevator car unit, at least one of said detectors is placed on the elevator car unit in a location, where the tension caused by the load is high.
  • a load measuring instrument of this type designed for the car of an elevator using hoisting ropes, is proposed e.g. in FI patent publication 75048.
  • the bottom of the elevator car rests on isolating elements resting on the horizontal shoulders of angle irons whose vertical shoulders are secured with screws on the bottom frame. Attached above and below each angle iron is a strain gauge. According to the publication mentioned, it is preferable to use four angle irons placed at the four corners of the bottom frame.
  • the strain gauges are difficult to mount by glueing, especially if they are to be mounted after first installation.
  • strain gauges are disclosed, located in the upper beam and in the lower beam of the car frame for measuring the weight of the car and the weight of the compensating cables. The signals derived from the strain gauges are used to determine the car load.
  • the object of the present invention is to eliminate the above-mentioned drawbacks and to achieve a system for producing elevator load data that is especially applicable in the modernization of elevators.
  • the procedure of the invention for producing elevator load data is characterized in that, based on the information obtained from the detectors, a car load signal and another load signal, used especially in the start setting of a hoisting motor drive and dependent on the position of the elevator car unit, are produced.
  • the apparatus of the invention can be easily added to existing elevators. As compared to a load weighing device placed under the elevator car, the invention provides the following advantages, especially significant in the modernization of elevators.
  • the elevator car need not be lifted to allow the mounting of the detectors, and therefore no extra space need to be provided below the overhead beam of the car frame. No additional insulating elements have to be provided under the elevator car because of the load measuring system, and no constructional changes need to be made in the structures under the elevator car.
  • the apparatus can be used in elevator car-frame systems in which no insulation is provided between the elevator car and the car frame.
  • the elevator system illustrated in fig. 1 comprises an elevator car unit 1 consisting of an elevator car 2 and a car frame, said unit moving along guide rails in a hoistway (not shown).
  • the car frame consists of overhead beams 3a and 3b, side beams 4 and bottom beams 5a and 5b (Fig.3).
  • the elevator car unit is moved using hoisting ropes 10 by means of a hoisting motor 6, transmission 7, traction sheave 8 and diverting pulley 9 placed in a machine room above the hoistway, the hoisting motor being provided with a control unit.
  • One end of the hoisting ropes is attached to a fixing point 11 between the overhead beams and the other end to a counterweight 12.
  • a car cable 13 is connected to the elevator car unit.
  • the overhead beams are attached to the same vertical beams, and the car is inside the car frame.
  • overhead beam 3a is provided with a strain gauge transducer 14 placed on top of the beam and connected via a conductor 15 to a central unit 16 placed on top of the elevator car.
  • the apparatus illustrated by fig. 2 comprises a strain gauge transducer 14, a connecting conductor 15 and an amplifier card 17 placed in a housing 18 provided with a lead-through 19. If a mains voltage supply and/or relay outputs are needed, then an adapter card 20 is also needed.
  • the detector used may be e.g. a strain gauge transducer as proposed in FI patent publication 62904, describing a transducer which, when attached by its ends with screws to a suitable base, senses the tensile and compressive stresses of the base in the longitudinal direction of the transducer. Attached between the ends of the body of the transducer are strain gauges which bend at their fixing points due to the tensile and compressive stresses of the base.
  • Fig. 3 shows an elevator car unit in which the overhead beams are attached to separate vertical beams 21a and 21b or the elevator car 2 is in an unsymmetrical position relative to the car frame.
  • two detectors 14 and 22 are used, one on each overhead beam.
  • the detectors are connected to the central unit via conductors 15 and 23.
  • the detectors produce signals indicating the force (load) applied to the hoisting ropes.
  • signals indicating changes in beam tension caused by installation errors or the guides of the elevator car This makes it possible to determine the quality of the installation as well as the kinetic friction of the elevator car system.
  • Fig. 4 shows an elevator car unit corresponding to the one in fig. 1, but with a hoisting rope pulley 24 attached to the overhead beam.
  • the unit is provided with a balancing means, which is attached to the bottom beam and consists of a beam 25 and a balancing chain 26 or equivalent.
  • the elevator car is in a symmetrical position relative to the car frame.
  • beam 25 is provided with a detector 27, connected to the central unit via conductor 28. The system makes it possible to check the balancing of the elevator system.
  • Fig. 5 shows an elevator car unit corresponding to that in fig. 4.
  • the overhead beams are attached to separate vertical beams and or the car is in an unsymmetrical position relative to the car frame.
  • the elevator car unit is provided with a rope pulley and the balancing means is attached to the bottom beam.
  • the unit has a compensation detector 27 providing absolute car position data.
  • Fig. 6 shows a diagram representing the principle of operation of the apparatus of the invention.
  • the central unit 16 comprises an amplifier card 17.
  • the amplifier is fed by a 24V d.c. voltage Vdc.
  • the amplifier card is connected via conductors to three detectors (detector1, detector2, detector3) 14, 22, 27 and has transistor outputs T connected to the control panel.
  • the conductors can also be replaced e.g. with a bus.
  • an adapter card 20 converting the mains voltage Vac into a d.c. voltage is used in connection with the central unit.
  • the apparatus may have relay outputs R connected to the control panel.
  • Fig. 7a represents the amplified output O1 of the measuring channel(s). It shows an output LF for a full car and an output LE for an empty car, which, due to the position dependent load caused by the car cable and the balancing means, rise linearly from the lowest floor A to the highest floor Y (horizontal axis), the difference between these outputs representing the load L.
  • the figure shows a constant output (offset) OS representing the load imposed by the weight of the elevator car unit itself.
  • Fig. 7b shows the compensation channel output O2, which is a linearly rising signal BT representing the load caused by the balancing means and the car cable.
  • FIG. 7c shows the load signal L, which is obtained by subtracting the offset OS and the weight of the elevator car unit, hoisting ropes and balancing means from the output O1 of fig. 7a.
  • Fig. 7d represents the linearly changing start setting data ST with incorrect or missing compensation. The difference between the middle value and the zero level observed at the start represents the compensation error OS′.
  • Fig. 8a illustrates the apparatus of the invention as applied in the case of a hydraulic elevator using a hydraulic lifting cylinder 29 for moving an elevator car unit 28.
  • the hydraulic system comprises a movable piston 29 inside the cylinder, a pressure pipe 31 and a lifting machine 32.
  • the latter consists of a hydraulic pump, a lifting motor and other equipment required for the lifting.
  • the piston is connected to the elevator car unit via an arm 33.
  • a car cable 34 is attached to the bottom of the car unit.
  • Placed on the supporting beam 35 under the lifting cylinder is a detector 14, along with a central unit 16 and a connecting conductor 15. In the case of fig. 8b, the detector is placed on the arm near the elevator car unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Elevator Control (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Control Of Electric Motors In General (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
EP90120654A 1989-11-10 1990-10-27 Procedure and apparatus for producing elevator load data Expired - Lifetime EP0427075B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI895376A FI84105C (fi) 1989-11-10 1989-11-10 Foerfarande och anordning foer att bilda belastningsdata i en hiss.
FI895376 1989-11-10

Publications (3)

Publication Number Publication Date
EP0427075A2 EP0427075A2 (en) 1991-05-15
EP0427075A3 EP0427075A3 (en) 1991-11-13
EP0427075B1 true EP0427075B1 (en) 1995-02-01

Family

ID=8529331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120654A Expired - Lifetime EP0427075B1 (en) 1989-11-10 1990-10-27 Procedure and apparatus for producing elevator load data

Country Status (8)

Country Link
EP (1) EP0427075B1 (ja)
JP (1) JP2540665B2 (ja)
AT (1) ATE117969T1 (ja)
AU (1) AU637843B2 (ja)
BR (1) BR9005697A (ja)
CA (1) CA2029422C (ja)
DE (1) DE69016581T2 (ja)
FI (1) FI84105C (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5441127A (en) * 1990-06-11 1995-08-15 Mitsubishi Denki Kabushiki Kaisha Elevator control apparatus
EP0849207B1 (en) * 1996-12-20 2003-10-22 Kone Corporation Procedure and apparatus for the measurement of elevator load

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4079886B2 (ja) * 2002-03-06 2008-04-23 三菱電機株式会社 エレベータの非常止め試験装置
WO2012031961A1 (de) 2010-09-09 2012-03-15 Inventio Ag Lastmesseinrichtung für eine aufzugsanlage
EP4330171A1 (en) * 2021-04-27 2024-03-06 KONE Corporation Load-bearing component, elevator and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2411023A (en) * 1945-04-28 1946-11-12 Otis Elevator Co Load weighing device
CH425134A (de) * 1963-11-21 1966-11-30 Schweiz Wagons Aufzuegefab Einrichtung zur Erzeugung eines von der Belastung einer Aufzugskabine abhängigen Signals für Aufzugssteuerungen
JPS5344737B2 (ja) * 1972-12-01 1978-12-01
GB2055207B (en) * 1979-05-25 1983-11-16 Tinsley Telcon Ltd Device for signalling load excess
IT1233979B (it) * 1989-03-08 1992-04-22 Biffi Spa Attuatore per valvole sottomarine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5441127A (en) * 1990-06-11 1995-08-15 Mitsubishi Denki Kabushiki Kaisha Elevator control apparatus
EP0849207B1 (en) * 1996-12-20 2003-10-22 Kone Corporation Procedure and apparatus for the measurement of elevator load

Also Published As

Publication number Publication date
CA2029422C (en) 1998-12-29
FI84105C (fi) 1991-10-10
BR9005697A (pt) 1991-09-17
AU6581690A (en) 1991-05-16
JP2540665B2 (ja) 1996-10-09
FI895376A0 (fi) 1989-11-10
FI84105B (fi) 1991-06-28
JPH03192081A (ja) 1991-08-21
DE69016581T2 (de) 1995-06-14
AU637843B2 (en) 1993-06-10
DE69016581D1 (de) 1995-03-16
EP0427075A2 (en) 1991-05-15
ATE117969T1 (de) 1995-02-15
EP0427075A3 (en) 1991-11-13
CA2029422A1 (en) 1991-05-11

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